Assuming this isn't part of your general lifestyle, and you won't be doing it again... I think you're giving it much more weight than it really deserves. I never drive after drinking at all, but that's because I'm not a very good driver and manage to have plenty of bumps without making it worse with alcohol.
I'd mention it if it comes up in conversation, but I don't see any need to make a big deal of it. It's not like your confessing to infanticide, or bigamy. I've known a couple of people who've had DUI's - and mentioned this as the reason why they don't drink at all if they're going to be driving - and I thought nothing of it.
If they'd tried driving when drunk with me as a passenger - that would be totally different. Same if they had more than one conviction, or made a habit of it.